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115 results on '"Deng, Yadong"'

3. Recent progress in metasurface-enabled optical waveplates

Author

Deng Yadong, Cai Ziru, Ding Yingtao, Bozhevolnyi Sergey I., and Ding Fei

Subjects
dynamic, multifunctional, optical metasurface, waveplates, Physics, QC1-999
Abstract

The polarization of light is crucial for numerous optical applications ranging from quantum information processing to biomedical sensing due to the fundamental role of polarization as another intrinsic characteristic of optical waves, which is uncorrelated with the amplitude, phase, and frequency. However, conventional optical waveplates that enable polarization control are based on the accumulated retardation between two orthogonally polarized electric fields when light propagates a distance much larger than its wavelength in birefringent materials, resulting in bulky configurations and limited functionalities. Optical metasurfaces, ultrathin arrays of engineered meta-atoms, have attracted increasing attention owing to their unprecedented capabilities of manipulating light with surface-confined configurations and subwavelength spatial resolutions, thereby opening up new possibilities for revolutionizing bulky optical waveplates with ultrathin planar elements that feature compactness, integration compatibility, broadband operation bandwidths, and multiple functionalities. Herein, we review the recent progress in metasurface-enabled optical waveplates, which covers both basic principles and emerging applications. We provide an overview of metasurface-based conventional half- and quarter-waveplates as well as their use in wavefront shaping applications, followed by a discussion of advanced waveplates, including multifunctional waveplates and all-polarization generators. We also discuss dynamic waveplates based on active metasurfaces. Finally, we conclude by providing our outlook in this emerging and fast-growing research field.

Published
2022
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30. Stable multiwavelength Tm‐doped fiber laser with a microfiber knot resonator

Author

Zexuan Qiang, Tao‐Ce Yin, Daru Chen, Zhou Yan, Yu Zhangwei, and Deng Yadong

Subjects
Materials science, business.product_category, business.industry, Doping, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Resonator, Knot (unit), Fiber laser, Microfiber, Optoelectronics, Electrical and Electronic Engineering, business
Published
2019

31. Asymmetric double-core fiber for hydraulic pressure sensing

Author

Wenshao Yang, Deng Yadong, Zexuan Qiang, Yu Zhangwei, Daru Chen, Zhou Yan, and She Lijuan

Subjects
Materials science, Computer simulation, Spectrometer, Acoustics, 02 engineering and technology, 01 natural sciences, Atomic and Molecular Physics, and Optics, Finite element method, Electronic, Optical and Magnetic Materials, 010309 optics, Core (optical fiber), 020210 optoelectronics & photonics, Control and Systems Engineering, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Demodulation, Charge-coupled device, Fiber, Electrical and Electronic Engineering, Instrumentation, Refractive index
Abstract

We propose a novel asymmetric double-core fiber (ADCF) which provides an ADCF-based hydraulic pressure sensing system without using optical spectrum measurement based on a costly optical spectrum analyzer. The ADCF is designed with asymmetric double fiber cores and two side air holes, which ensure the asymmetric pressure-induced phase change for the guiding light in the two fiber cores. Based on the finite element method, optical properties of the ADCF under hydraulic pressure are investigated considering the fiber parameters such as the refractive index, the distance of two holes or two fiber cores, the size of two fiber cores and the fiber length. A hydraulic pressure sensing system based on the ADCF and a low-cost linear array charge coupled device (CCD) is proposed, where the hydraulic pressure demodulation is achieved by measuring the movement of the spatial interference pattern of the light from the double fiber cores of the ADCF. Numerical simulation shows that the hydraulic pressure sensor based on a 10-cm ADCF and a 2.867-cm CCD has a sensing range from 0 to 900 MPa and a sensitivity of 0.3 mm/MPa. In this paper, a low-cost CCD is used instead of a costly spectrometer, which greatly reduces the cost of the sensing system. The proposal for the ADCF and the solution for hydraulic pressure sensing are of great significance to promote the wide application of the hydraulic pressure fiber sensor.

Published
2019

36. Hydraulic Pressure Sensor based on an Asymmetric Double-core Fiber

Author

Yan Zhou, Deng Yadong, Yu Zhangwei, Daru Chen, Zexuan Qiang, and Lijuan She

Subjects
Materials science, business.industry, Physics::Optics, Pressure sensor, Physics::Geophysics, law.invention, Core (optical fiber), Pressure measurement, law, Fiber optic sensor, Optoelectronics, Fiber, Photonics, business, Refractive index, Photonic-crystal fiber
Abstract

Based on an asymmetric double-core fiber (ADCF), a novel hydraulic pressure sensing system without optical spectrum measurement using an optical spectrum analyzer is proposed. Simulation shows a system with 0.3mm/MPa.

Published
2018

37. Experimental study of high-power 1-MHz, 1.2-ns pulsed Yb fiber laser using gain-switching

Author

Daru Chen, Yan Zhou, Zexuan Qiang, Yu Zhangwei, Lijuan She, and Deng Yadong

Subjects
Ytterbium, Materials science, Preamplifier, business.industry, Amplifier, chemistry.chemical_element, Laser, Power (physics), law.invention, Gain-switching, Surface micromachining, chemistry, law, Fiber laser, Optoelectronics, business
Abstract

We propose a compact high-power, ~1ns, MHz pulsed ytterbium laser for micromachining using gain-switching and master oscillator power amplifier (MOPA) technique . We preliminary obtained a 1.2-ns, 1-MHz, 49-mW average single-mode output power before MOPA.

Published
2018

38. Upconversion luminescence in Thulium-Doped NaYF4 Nanoparticles Excited by a 980 nm Laser

Author

Yan Zhou, Deng Yadong, Yu Zhangwei, Renren Deng, Zexuan Qiang, Lijuan She, Daru Chen, and Xin Su

Subjects
Materials science, business.industry, Doping, chemistry.chemical_element, Laser, Photon upconversion, Photon counting, Semiconductor laser theory, law.invention, Thulium, chemistry, law, Optoelectronics, Photonics, business, Luminescence
Abstract

Upconversion luminescence at ~800 nm based on Thulium-doped NaYF4 nanoparticles excited by a 980 nm laser has been experimentally demonstrated. Under different concentrations, the fluorescence power is proportional to the pump power.

Published
2018

48. Research on Integration of Automotive Exhaust-Based Thermoelectric Generator with Front Muffler

Author

Chu Panqi, Chunhua Liu, and Deng Yadong

Subjects
Muffler, Engineering, business.industry, 020209 energy, Mechanical engineering, 02 engineering and technology, 021001 nanoscience & nanotechnology, Automotive engineering, law.invention, Thermoelectric generator, law, 0202 electrical engineering, electronic engineering, information engineering, 0210 nano-technology, business, Automotive exhaust, Front (military)
Published
2016

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